Dust-collector.



G. F. SHERWOOD.

DUST COLLECTOR.

APPLICATION FILED NOV- s. 1910.

2 SHEETS-SHEET l.

Patented Aug. 31, 1915.

G. F. SHERWOOD.

DUST COLLECTOR.

APPLICATION FILED NOV. 5.1910. 1 1 125, Patented Aug. 31, 1915.

2 SHEETSSHEET 2.

GEORGE F. SHERWOOD, OF NEW ORLEANS, LOUISIANA.

DUST-COLLECTOR.

Specification of Letters Patent.

Patented Aug. 31, 1915.

Application filed November 5, 1910. Serial No. 590,793.

To all whom it may concern Be it known that I, GEORGE F. SHERWOOD, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented certain new and useful Improvements in Dust-Collectors, of which the following is a specifica tion.

My invention relates to improvements in dust collectors, and has particular reference to centrifugal dust collectors wherein the dust-laden air current is projected into a suitable casing to rotate therein, massing the dust or material in a circumferential stratum as the result of centrifugal effect for delivery through a bottom dust outlet, while the air escapes through a top air outlet.

One of the salient objects of my invention is to provide for the. reduction of backpressure engendered in such machines by centrifugal resistance to the air escape, and to this end, among others, I provide a novel and effective tubular guard arrangement, embodiments whereof are shown-in the ac companying drawings, in which Figure 1 is a vertical cross section of a dust collector embodying my invention; Fig. 2 is a plan View thereof; Fig. 3 is a horizontal section on line 3--3 of Fig. 1; Fig. 4 is a vertical section of a modified form of construction embodying the invention; Fig. 5 is a horizontal section on line 55 of Fig. 4; and Fig. 6 is a horizontal'section showing a slightly different arrangement of deflector.

In the drawings, 10 indicates in general a casing body, providing an upper casing member 11, a lower conoidal member 12, and a head 13. A supply pipe 14 opens tangentially to the casing through the inlet opening, 15, at the periphery of the upper casing member 11 immediately below the head 13 and an air outlet opening 17 is made through the head 13 preferably at the axis of the casing. From the bottom of the conoidal member 12 of the casing opens an axial dust outlet 18 for the discharge of the collected dust or. material( These parts of the dust collector in general are well known to those skilled in the art and may be of divers forms, two forms being illustrated in the drawings, to indicate that the invention is not limited to the details of shape of the exterior casing, Figs. 1 to 3.

b5 showing a casing structure in which the upper casing member 11 is conoidal, and Figs.

4 and 5 showing a construction in which said upper member 11 is cylindrical. It will further be understood by those skilled in the art that the parts described are illustrated only conventionally and should be proportioned to the work on hand in accordance with recognized practice.

Within the head opening, 17 I provide atubular guard 20 forming an escape passage for the air, said guard preferably being of cylindrical form, and having vertically extended'openings, 21, in its side wall for the passage of air currents, these openings 21 preferably aggregating an area something in excess of the inlet area. The interior of the guard is preferably substantially unobstructed, and upon its exterior are provided suitable structures which I will generally term deflectors for interrupting the whirl of air exteriorly beyond the guard in the zone horizontally contiguous to the circumferential openings of the guard. Specifically, I prefer that the guard opening 21 be relatively long and narrow, vertically disposed, and that contiguous to said opening on the exterior of the guard, there be arranged deflectors capable of interrupting the whirl of air and preferably shaped so that their radially outermost edges may approximately conform to the lines of the contiguous portions of the side wall of the casing. Thus, as shown in Fig. 1, where the upper Wall of the casing slopes, I prefer that the outer edges of the deflectors shall slope conformably, while with a straight- Walled or cylindrical construction of the upper casing portion, as indicated in Fig. 4, the edges of the deflectors 21 may be vertical. It is my preference that the deflectors be curved in plan, the free edge of each deflector being preferably in rear of the attached edge thereof with reference to the direction of rotation of the air within the casing. As shown in Fig. 6, however, the

radius of the deflectors extend to or beyond the radius of the inner edge of the air inlet and to have the inlet at a less radial distance from the center than the maximum diameter of the casting, as indicated in Fig. 1.

In operation, the material-laden air introduced tangentially into the casing sets up a whirl within the casing, so that by centrifugal effect the dust is massed against the outer wall for descent in the bottom of the cone 12 and is delivered to the dust outlet 18. Where it is necessary for the air to travel inwardly toward the axis of the casing while in whirl, 'such inward progress is retarded by centrifugal resistance, and results in the creation of back-pressure upon the fan. In the apparatus described, however, the rotation of the air is broken up by the deflectors before the area of the guard is reached, thereby obviating, in whole or in part, the cause of such centrifugal resistance and enabling the air to flow in directly, substantially without rotation, through the circumferential openings through the side of the tubular guard to escape axially of the guard through the open end thereof. Thus the back-pressure is reduced by the disruption of the whirl in a zone lying'between the ends of and circumscribing the guard, but radially inside of the stratum of massed dust or material.

The relative freedom or restriction of the lower end of the tubular guard may be regulated in. the construction of' the machine according to whether it is desired that the material be forcibly blown out through the dust 'outlet 18 or delivered through said outlet without a forcible air blast. latter case, the lower end of the tubular guard may be left substantially unobstructed, but for delivery of the material with some force, the path of communication between the outlet 18 and the lower end of the guard may be obstructed to greater or less degree, by the use of a shield 23, as shown in the drawings, or otherwise, but theuse of such obstruction means is not essential to the embodiment of my invention.

While I have herein described in some detail a particular embodiment of my invention for purposes of full disclosure, it will be apparent to those skilled in the art that numerous changes in the details of construction and arrangement might be made without departure from the spirit of my invention and within the scope of the appended claims.

What I claim is:

1. The combination with a dust collector casing provided with a tangential inlet adj acent its up er end, and air outlet from its upper end, and a dust outlet at its bottom; of a tubular guard associated with said air In the with circumferential openings through its side walls between its ends, and whirl-interrupting deflectors, having their radially 'outer edges shaped conformably with the proximate wall of the casing interposed between said tubular guard and the casing wall and located in the horizontal zone of said circumferential openings of the guard for direction of air in generally radial flow, in said zone, for delivery through the side openings of the guard; the structure providing within the casing a vertically and horizontally free chamber below the guard, wherein the air may form a vortical whirl adjacent to the dust outlet, and providing radially beyond the said deflectors a free space of substantially uniform radial dimensions freely opening to said space below the tubular guard, and freely communicating with the tangential inlet.

2. In a dust collector, the combination with a casing provided with a peripheral inlet opening, an air outlet opening at its upper end and a dust outlet opening at its lower end; of a tubular guard associated with said air outlet opening extending downwardly therefrom relatively close to the axis of the casing and of substantially uniform diameter throughout, said guard having therein a plurality of longitudinally extended relatively narrow circumferential openings, and deflectors, curved in plan, mounted upon the exterior wall of said guard, contiguous to said openings and extending outwardly from said guard to a relatively great distance to interrupt the whirl of the air in the horizontal zone of the said circumferential openings to direct the air, substantially in radial lines free from whirl, toward the axis of the casing, whereby to overcome centrifugal resistance to the axial escape of the air throughout an area of much greater extent than the diameter of the guard, there being below and around the guard and deflector structures a free space confined only by the walls of the casing, in which the air may establish a vortical whirl.

8. In a dust collector, the combination with a casing, provided with a peripheral inlet opening, an air outlet opening at its upper end and a dust outlet opening at its lower end; of a tubular guard associated with said air outlet opening extending downwardly therefrom relatively close to the axis of the casing and of substantially uniform diameter throughout, said guard having thereon a plurality of longitudinally extended relatively narrow circumferential openings, and deflectors, curved in plan, mounted upon the exterior wall of said guard, contiguous to said openings and extending outwardly from said guard to a relatively great distance therefrom to interoutlet, 'havmg a bottom opemng provided rupt the whirl of the air in the horizontal zone of said circumferential openings to direct the air, substantially in radial line free from whirl, toward the axis of the casing, thereby to overcome centrifugal resistance to the radial escape of the air throughout an area of much greater extent than the diameter of the guard, said deflectors having their radially outer edges shaped conformably with the proximate wall of the 10 casing, there being below and around the guard and deflector structure a free space, confined only by the walls of the casing, in which the airmay establish a vortical Whirl. In testimony whereof I hereunto set my hand in the presence of two witnesses.

GEORGE F. SHERWOOD.

In the presence of W. E. ALmNGToN, R. G. BOSTWIGK. 

